/*---------------------------------------------------------------------------*
  Project:  NitroSDK - MB - demos - multiboot
  File:     common.c

  Copyright 2003,2004 Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Log: common.c,v $
  Revision 1.2  2004/09/17 10:33:11  takano_makoto
  Deleted PXI_InitFifo and OS_InitThread

  Revision 1.1  2004/09/16 14:07:18  takano_makoto
  Initial Update

  $NoKeywords: $
 *---------------------------------------------------------------------------*/


#include <nitro.h>

#include "common.h"
#include "disp.h"


static void VBlankIntr( void );

/*
 * Common functions used throughout this demo. 
 */
static u16 padPress;
static u16 padTrig;

/*---------------------------------------------------------------------------*
  Name:         ReadKey

  Description:  Key read processing 

  Arguments:    None

  Returns:      None
 *---------------------------------------------------------------------------*/
void ReadKey( void )
{
    u16 currData = PAD_Read();
    
    padTrig = (u16)( ~padPress & currData );
    padPress = currData;
}

/*---------------------------------------------------------------------------*
  Name:         GetPressKey

  Description:  Gets the pressed key 

  Arguments:    None

  Returns:      Bitmap for the pressed key 
 *---------------------------------------------------------------------------*/
u16 GetPressKey( void )
{
    return padPress;
}


/*---------------------------------------------------------------------------*
  Name:         GetTrigKey

  Description:  Gets the key trigger 

  Arguments:    None

  Returns:      Bitmap for the key trigger 
 *---------------------------------------------------------------------------*/
u16 GetTrigKey( void )
{
    return padTrig;
}


/*---------------------------------------------------------------------------*
  Name:         CommonInit

  Description:  Common initialization function 

  Arguments:    None

  Returns:      None
 *---------------------------------------------------------------------------*/
void CommonInit( void )
{
    /* OS initialization  */
    OS_Init();
    OS_InitTick();
    OS_InitAlarm();
    FX_Init();
    
    /* GX initialization  */
    GX_Init();
    GX_DispOff();
    GXS_DispOff();
    
    /* V-blank interrupt settings  */
    (void)OS_SetIrqFunction( OS_IE_V_BLANK, VBlankIntr );
    (void)OS_EnableIrqMask( OS_IE_V_BLANK );
    (void)OS_EnableIrqMask( OS_IE_FIFO_RECV );
    (void)GX_VBlankIntr( TRUE );
    
    {   /* FS initialization  */
        static u32 fs_tablework[0x100 / 4];
        FS_Init(FS_DMA_NOT_USE);
        (void)FS_LoadTable(fs_tablework, sizeof(fs_tablework));
    }
    
    // Reads the key blank once 
    ReadKey();
}


/*---------------------------------------------------------------------------*
  Name:         InitAllocateSystem

  Description:  Allocates on the main memory using the aligner and initializes the system. 

  Arguments:    None.

  Returns:      None.
 *---------------------------------------------------------------------------*/
void InitAllocateSystem( void )
{
    void*           tempLo;
    OSHeapHandle    hh;

    // Assumes OS_Init has been called 
    tempLo = OS_InitAlloc( OS_ARENA_MAIN ,
                           OS_GetMainArenaLo() ,
                           OS_GetMainArenaHi() ,
                           1 );
    OS_SetArenaLo( OS_ARENA_MAIN, tempLo );
    hh = OS_CreateHeap( OS_ARENA_MAIN , 
                        OS_GetMainArenaLo() ,
                        OS_GetMainArenaHi() );
    if ( hh < 0 )
    {
        OS_Panic("ARM9: Fail to create heap...\n");
    }
    hh = OS_SetCurrentHeap( OS_ARENA_MAIN, hh );
}




/*---------------------------------------------------------------------------*
  Name:         VBlankIntr

  Description:  Gets the key trigger 

  Arguments:    None

  Returns:      None
 *---------------------------------------------------------------------------*/
static void VBlankIntr( void )
{
    DispVBlankFunc();
    
    //---- Interrupt check flag 
    OS_SetIrqCheckFlag( OS_IE_V_BLANK );
}
